Plaster-board and method of making same



J. SCHUMACHER. PLASTER BOARD AND METHOD or MAKING SAME.

APPLICATION HLED DEC-Z2, I919. I

Patented May 3, 1921.

r ZZ 3 m w 3 5 m k Y 1.. SCHUMACHER. PLASTER. BOARD AND METHOD OF MAKING SAME. APPLICATION FILED DEC. 22, 19!.9,

1,376,784. Patented May 3,1921.

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.Zhven for Liblzn .Schu/rnachez' his Aflomeys J. SCHUMACHER.

PLASTER BOARD AND METHOD OF MAKING SAME.

APPLICATION men DEC. 22. I919.

1,376,784. Patented May 3,1921.

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.PLASTER-BOARD AND METHOD OF MAKING SAME.

Specification of Letters Patent.

Patented May 3, 1921.

Application filed December 22, 1919. Serial No. 346,535.

To all whom it may concern Be it known that I, J OIIN SoHUMAoHER, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Plaster-Board and Methods of Making Same, of which the following is a specification.

This invention relates to an improved plaster board for building constructions and the like and to a method of producin the same. The invention pertains partlcu arly to a board formed of plastic material entirely incased in a single covering sheet.

It is an object of this invention to provide a substantial and durable plaster board, which will withstand the rough usage of handlin and will not chip or peel at the sides. accomplish this by forming an endless coverin for the plaster. It is another object of this invention to provide a plaster board, in which the plaster is mc'ased in a single integral covering sheet with the edges of the sheet lapped. It 1s a further object of this invention to provide a process for making such a board, whereby a single covering sheet is continuously advanced, folded to form a top and bottom covering, plastic material placed thereon, and the ends of the sheet lapped to completely inclose the plaster.

I accomplish the above mentioned ob e cts as well as other objects and corresponding accomplishments by means of the board illustrated in the accompanying drawing, and by means of an apparatus for carrying out the process for producing such board. The means shown herein is for illustrative purposes only.

Referring to the drawing, Figure 1 1s a fragmentary sectional view of a machlne for carrying out my process; Fig. 2 is an enlarged section taken on the line 2-2 of Fig. 1; Fig. 3 is an enlarged section taken on the line 3-3 of Fig. 1; Fig. 4 is an enlar ed section taken on the line 4-4 of Fig. 1; Fig. 5 is a section taken on the line 5-5 of Fig. 3; Fig. 6 is a form of board produced by the means shown in Figs. 1 to 5 inclusive; and Fig. 7 is a board made according to my invention and process.-

The plaster board is made by advancing a sheet of paper, spreading a layer of plaster material thereon, then folding over the edges of the sheet so as to lap, and passing the same between compression rollers. The

unfinished board as it emerges from the compression rollers may be severed into initial lengths and handled in the usual manner to carry out the succeeding steps in makin finished plaster board, such steps being we 1 known in the art.

Referring more particularly to Fig. 1, a conveyer for advancing the laster board is indicated generally by A. 1? folder for the paper 1s ndicated generally by B, and means for feedirg the wet plastic material is indicated by The compression means is indicated by D.

Referring more specifically to the drawing, 8 1s an endless conveyer by means of which a web 9 of aper or like material for formlng the covermg is advanced. The web 1s fed from a roller 10 and passed over an idler 11. From the idler the web passes around a creasing roller 12. Creasers 13 havlng alrs of ribs 14 journaled on blocks 15, whlc are slidingly mounted upon a we 16. The blocksmay be adjusted by a thread ed shaft 17 provided with a hand wheel 18. The Way is pivotally mounted. Secured to arms 19 extending from the way are tension springs 20 holding the creasers against the creasing roller. From the creasing roller the paper advances onto the conveyer 8.

The web is passed onto the conveyer from the creasing roller 12 flat. In order to turn over the edges, rollers 21 and 22 are journaled on the frame of the machine with their axes in a vertical position. Corner pieces 23 and 24 are disposed in such position that they will register with the creases formed on the sheet of paper and provide guide means for folding. As it may be convenient to cement the lapping edges of the paper, a receptacle 25 of cylindrical form is provided with a spout 26 whose mouth faces roller 22 so that the under side of the lap 34 of the paper will pass in front of the mouth and have adhesive cement applied thereto. Within the cylinder 25 is a piston 27.

g'Cement or adhesive material is placed in the receptacle below the piston, and fluid pressu'e exerted on the piston from the upper s1 e.

As the paper leaves the guide rolls, plastic material is spread thereover from a spout 28 connected to the source of supply of plastic material. The edges of the paper are turned over and passed beneath a com ression roller shown specifically in Fig. 4:. t the sides of the conveyer are dams 29 to hold the edges of the board against bulging while the compression roller 30 is actlng thereon. Compression roller 30 is .journaled in blocks 31 which are pressed toward the top of the plaster 'bo'ard by means of compression sprin s 32. Hand screws 33 are provlded for adjusting the compression of the springs.

The paper is strung from the creasing roller 12 around the corner pieces 23 and 24, against the guide rollers 21 and .22, and under the compression roller 30 with the edges lapped as indicated by 34, the conveyer is then set in operation and the plastic material fed from the spout 28. After the unfinished board emerges from the compression roller 30, it is handled in the usual manner.

The finished board is shown in Fig. 6. The web of paper has been folded inwardly so that there is a bottom covering 35, side coverin 38 and 39, and top coverings 36 and 37 a pped as indicated by 34, all formed of a single sheet. This provides for a plaster board having a single covering sheet embracing the plastic material 40 and leaving no exposed side edges. The advantages of such a board are obvious.

In Fig. 7 I have shown a board entirely inclosed, but with the lapping portion 41 formed adjacent one end of the board. However, the board has no unexposed side edges and the plaster is embraced by a single sheet of covering material.

In both of the boards shown, no exposed plaster is presented at the side edges. There will therefore be a uniform absorption of moisture over the entire surface of the board at the edges. The side edges of the board are straight and require no finish. Being covered at the side edges, there will be no chipping in the handling of the board, and a finished uniform product can be delivered to the builder.

What I claim is:

l. The process of making plaster board which consists in advancing a single inte ral sheet of covering material, folding the e es of said sheet, introducing plastic materlal therein, and in-folding the edges of said sheet so as to lap.

2. The process of making plaster board which consists in advancing a single inte ral sheet of covering material, folding the e ges of said sheet to form a trough, introducing plastic material into said trough, and infolding the edges of said sheet so as to lap.

3. The process of making plaster board which consists in advancing a single inte ral sheet of covering material, folding the edges of said sheet toform a trough, introducing plastic material into said trough, infolding the edges of said sheet so as to lap, and compressing the board.

4. A plaster board comprising a single imperforate covering sheet of paper wrapped around a plastic substance and adhering thereto.

- 5. A plaster board comprising a single imperforate covering sheet of paper, folded so that the edges lap, and a plastic core disposed therein and to which the sheet adhlelares whereby the core is enveloped by the s eet.

In witness that I claim the foregoing I JOHN SCHUMAGHER. 

